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MakcuM [25]
3 years ago
13

Evaluate the following expression if a=-9, b=-7,c=9 and d=3 2cd + 3ab =

Mathematics
1 answer:
stepladder [879]3 years ago
7 0

Answer:

<h3>The answer is 243.</h3>

Step-by-step explanation:

To evaluate the expression substitute the values of a , b , c and d into the above expression

a = - 9

b = - 7

c = 9

d = 3

So we have

2cd + 3ab = 2(9)(3) + 3(-9)(-7)

= 2(27) + 3( 63)

= 54 + 189

We have the final answer as

<h3>243</h3>

Hope this helps you

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Tiles (6" by 6") can be installed at the rate of 50 per worker hour. The floor of a large lobby area (80’ by 40’) is to be cover
RideAnS [48]

Answer:

Step-by-step explanation:

Tiles (6" by 6") can be installed at the rate of 50 per worker hour. Since the tile is a square, its area is

L^2 = 6^2 = 36 inches square

So in an hour, a worker installs 50 tiles whose area is 36 inches square. Total square meters installed per hour will be 50 × 36 = 1800 inches square per hour.

If three workers are assigned to this task, their work rate will be

1800 × 3 = 5400 inches square per hour.

The floor of a large lobby area (80’ by 40’) is to be covered with these tiles. We would convert from feet to inches.

1 foot = 12 inches

80 feet = 80 × 12 = 960 inches

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If the 3 workers install 5400 inches square in 1 hour,

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Converting to the nearest whole day, it becomes

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4 0
2 years ago
Divide 1.20m in the ratio 2:3:4 what's the answer
Vikki [24]
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3 years ago
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Fofino [41]

Answer:

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Step-by-step explanation:

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b - y-intercept

so if you plug in 8 for m and -8 for b you'll get

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Hope this helps!!

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I am slightly confused. What exactly is the question?

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Step-by-step explanation:

(not sure if right but had a go)

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